How can I differentiate MOH duties & Wedding Planner/Stylist role, I have been asked to do both?

I am an event planner and stylist by trade, one of my close friends asked me to help her and her partner plan and style the wedding, organize florists, etc with compensation, I also assisted with their engagement. Since asking me to assist in the planning and styling, she has asked me to be her MOH, which is so exciting! However my dilemma is that it is to my understanding that a number of MOH duties also fall under the event styling/planner area, particularly the “act as the wedding planner, give out your phone number to all of the key vendors and family members in advance so you can help field any questions for the bride" I’m not sure what to do now or where to draw the line for each role. Any advice would be greatly appreciated